M1 Garand is a Brazilian raw black metal solo project formed in 2022, with all instruments, vocals, mixing, and mastering handled by a member operating under the alias Soldier 'Charles' of 101st Airborne Division. The project carries an explicit anti-Nazi and anti-NSBM stance, reflected in its debut EP "The Party is Over Kraut" (2022), which blends World War II themes with sardonic humor directed at fascist ideology.

M26 is an atmospheric doom/death metal band from Pelotas, Rio Grande do Sul, Brazil, formed in 2021. The band incorporates female vocals into their heavy, melancholic sound, and released their debut album "Misantropia" in February 2021 through Bandcamp.

M60 in Hands is a raw black metal and noise solo project from Catanduva, São Paulo, Brazil, formed in 2023 and operated entirely by Billy Grind, who handles all instruments and vocals. The project released the EP "Infinity War in My Head" in 2023 and appeared on the 2024 split "Old Skull Black Metal" alongside Night Goat on Podreira Records, paying tribute to first-wave black metal acts Von and Root.

M67 is a groove metal and hardcore band from Manaus, Amazonas, Brazil, founded in 2017 by Naveca Ogro and Gabriel Alladoh and named after the M67 fragmentation grenade. The band draws on Amazonian folklore for lyrical content, explored in their EP "Agouros Amazônicos," which features tracks themed around legends of the Brazilian Amazon including the single "Mapinguari Algoz" (2020).

Macabro is a speed metal/punk band from São Paulo, Brazil, featuring Ruan Pablo on vocals, Gui Disanti on guitar, Naum Prado on bass, and Uriel Franco on drums. The band channels working-class protest energy alongside themes of Satanism and anarchy, and released the album "Mensageiros do Caos" (Messengers of Chaos) in December 2023.

Macacos da Manchúria is a death/doom metal project from São José dos Campos, São Paulo, Brazil, formed in 2021 by brothers Alexandre Paloschi (vocals, guitars, drum programming) and Henrique Paloschi (bass, guitars). The band's name is a tribute to victims of Unit 731, and their debut full-length "Bessa" (2022) — recorded, mixed, and mastered entirely by Alexandre Paloschi — was composed and produced in a home studio between August and December 2021.

Machinaria were a heavy/thrash metal band from Bagé, Rio Grande do Sul, Brazil. Their 2014 debut full-length Sacred Revolutions, Profane Revelations drew comparisons to second-wave American thrash acts such as Sacred Reich and Vio-Lence, and was built around a conceptual examination of the Catholic Inquisition. The album earned the band recognition as a standout name in the new generation of Brazilian thrash.

Machocabrio is a stoner and hard rock band from Chillán, Chile who debuted with their album Altibajos in July 2015. The nine-track record blends stoner grooves, rock and roll energy, and Spanish-language songwriting in a style rooted in the heavy rock tradition.

Macáes is a one-man post-black metal and shoegaze project by Fernando, based in Puerto Deseado, Santa Cruz province — one of the southernmost metal acts in Argentina. The project released the split Pureza y Caos alongside Chilean atmospheric act Lapageria Rosea in January 2013, contributing three tracks composed in July 2012: "Símbolo de Mutación," "Decadence," and "Condenados A Nuestra Iniquidad." The project blends black metal intensity with shoegaze texture in an ambient, atmospheric style.